/in/foo.cc: In function 'int main()':
/in/foo.cc:10:20: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
 #define rep(i,j,k) for(i=j;i<=k;++i)
                    ^
/in/foo.cc:65:2: note: in expansion of macro 'rep'
  rep(i,1,n)BFS(i);ans2=inf;
  ^~~
/in/foo.cc:65:19: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  rep(i,1,n)BFS(i);ans2=inf;
                   ^~~~